These hooks are slightly hakelig (are indeed hook - ha ha: D) but they work ultimately. But you have to watch something that you can be scratched due to nothing of the ridge. In addition, these bars are easily deformed. For the price of about 3 euros incl. Shipping but fine. I can live with, and I need this release key only rarest. Conclusion: Conveniently - works for the few times that I need it - what more could you want?